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Step 9Assemble the Wheel
Now you'll need to attach your sensor assembly to the wheel as well as attach the magnet. Here again I've used zip ties and hot glue to secure the pen casing to the wheel stand.
Make sure that when you attach the sensor assembly and the magnet that they are close enough for the switch to trigger but that the wheel still spins freely. Also ensure that the switch is facing the correct direction. When you purchase the contact switch, many times they will specify the minimum distance to the magnet. If you use a stronger magnet (like a neodymium hard drive magnet) you may have a little more leeway.
If you listen carefully you can usually hear a click every time the wheel goes around. If you don't hear that click it might be worth checking your switch / magnet configuration to ensure everything is aligned correctly.
Make sure that when you attach the sensor assembly and the magnet that they are close enough for the switch to trigger but that the wheel still spins freely. Also ensure that the switch is facing the correct direction. When you purchase the contact switch, many times they will specify the minimum distance to the magnet. If you use a stronger magnet (like a neodymium hard drive magnet) you may have a little more leeway.
If you listen carefully you can usually hear a click every time the wheel goes around. If you don't hear that click it might be worth checking your switch / magnet configuration to ensure everything is aligned correctly.
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